TB02: Rainfall intensities and drainage design for flat roofs

This technical bulletin is designed to provide a basic introduction to the selection of rainfall intensities for the design of flat roof drainage and internal pipework.

Contents:

• Introduction
• Rainfall intensity vs duration of storm
• Interface with underground drainage
• How to design rainfall to BS EN 12056-3:2000
• Catchment Areas
• Overflow provision
• Roofs which reduce flow
• Summary
• Glossary of terms

Acknowledgements

Author: Dr Malcolm Wearing BEng PhD CEng MICE MCIWEM